Fiberglass pool badly stained

[PoolDoc]

First, the staining you see is a symptom of a much more expensive problem - corrosion of your copper heat exchanger.

but . . .

Last year I noticed that below the water line was becoming stained and couldn't figure out why. Tried metal out, jack's magic and a couple of other products with no results. Fast forward to now, pool is drained down about 1/3 and the staining is really bad, about the color of oak from the water line down. Figured I'd try some muriatic acid on a test area and it worked great for bringing it almost back to white. Gave the test area a good rinse when I was done.

Michelle, acid does not usually remove copper stains from surfaces. Copper stains are black or green-to-blue, not "oak" color.

Also, there are NO metal control products that are "removers". Proper use of some of them, IN CONJUNCTION with filtration, can sometimes 'stain' the filter, instead of the pool.

If you choose to address chemical issues, please be careful to post based on your own field experience, rather than what you've been taught in a sales meeting. Many of the things that everybody in the pool knows to be true . . . aren't actually true. So, if you don't know something to be a fact from your own experience, as a service tech or a chemist or a manufacturing engineer, please don't post it as if it's true. Instead, report it as "many in the pool industry think . . . " whatever it was you wanted to state.

We'd welcome any genuine expert knowledge you have . . . such as specific information about your company's products, or about FG pools generally, especially if you also know ways to solve those problems. "Poolsean" does this very well with salt products, including his own.

But, please avoid offering generic solutions that someone in your company believes in, unless you know for a fact that these solutions are valid ones. Using a liquid metal control product, like ProTeam's "Metal Magic" will not, all by itself, solve problems with metal staining. And the HEDP based "Metal Magic" will do virtually nothing to solve problems with the iron stains that are Hoogie's problem. Nor, as far as I know, will Haviland's product, which is called "Stain Elimitor" (their spelling, not mine!), not "Metal Magic".

Also, please note that I've added the required ID signature to your profile, so that any future posts will be properly identified, as required by the Forum TOS.

Thanks,

Ben

Metal Magic (MSDS showing HEDP content attached):